GB1350247A - Welding control apparatus - Google Patents

Welding control apparatus

Info

Publication number
GB1350247A
GB1350247A GB3187771A GB3187771A GB1350247A GB 1350247 A GB1350247 A GB 1350247A GB 3187771 A GB3187771 A GB 3187771A GB 3187771 A GB3187771 A GB 3187771A GB 1350247 A GB1350247 A GB 1350247A
Authority
GB
United Kingdom
Prior art keywords
welding
curve
ignitrons
control
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3187771A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weltronic Co
Original Assignee
Weltronic Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weltronic Co filed Critical Weltronic Co
Publication of GB1350247A publication Critical patent/GB1350247A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/248—Electric supplies using discharge tubes

Abstract

1350247 Control systems for resistance welding WELTRONIC CO 7 July 1971 [24 July 1970] 31877/71 Heading H2H A resistance welding control system comprises a pair of back-to-back ignitions by means of which a welding load is connected to an alternating current source, means being provided to sense both the power factor of the load and the passage of the welding load current through its zero values, the signals produced by the sensing means being used to control a curve generating means which produces a curve having a preselectable constant characteristic portion and a portion having a selectably variable slope characteristic, the power factor sensing means initiating the generation of the preselectable constant characteristic portion of the curve and the zero crossing sensing means subsequently controlling the generation of the selectably variable slope characteristic portion of the curve, the curve being used to control the points in the half-cycles of the alternating current source such that the current and thus the amount of heat developed in the welding process are controlled. The control system enables a wide latitude in the selection of the firing angles thus allowing the ignitrons to be fired earlier in the half-cycles of the A.C. supply than is normal. Filters are provided to suppress transient conditions in order to improve the operation of the ignitrons and means are provided to prevent the firing of the ignitrons in the first half-cycle of the supply during an operation so as to prevent saturation of the transformers in the system; further means being provided to ensure that the ignitrons operate in a normal lead-trail mode. The control system is arranged for single and repeat operations and may be arranged to control two separate welding apparatus. A decade counting device is provided to time the various parts of a welding operation such as the presqueeze, squeeze, weld, hold and off periods. The control system comprises a plurality of transistors and thyristors. Specifications 1,067,893 and 1,199,429 are referred to.
GB3187771A 1970-07-24 1971-07-07 Welding control apparatus Expired GB1350247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00058126A US3832518A (en) 1970-07-24 1970-07-24 Welding control apparatus

Publications (1)

Publication Number Publication Date
GB1350247A true GB1350247A (en) 1974-04-18

Family

ID=22014858

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3187771A Expired GB1350247A (en) 1970-07-24 1971-07-07 Welding control apparatus

Country Status (3)

Country Link
US (1) US3832518A (en)
CA (1) CA973257A (en)
GB (1) GB1350247A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001007229A2 (en) * 1999-07-21 2001-02-01 Caco Pacific Corporation Closed loop interactive controller

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254466A (en) * 1979-01-29 1981-03-03 Square D Company Power factor monitoring and control system for resistance welding
US4289951A (en) * 1979-02-16 1981-09-15 Square D Company Power factor monitoring and control system for resistance welding with line disturbance immunity
US5408067A (en) * 1993-12-06 1995-04-18 The Lincoln Electric Company Method and apparatus for providing welding current from a brushless alternator
US6286127B1 (en) * 1998-02-06 2001-09-04 Texas Instruments Incorporated Control circuit having multiple functions set by a single programmable terminal
US20050128656A1 (en) * 2003-12-16 2005-06-16 Croyle James T. Semiconductor switch pulse discharge module

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234963A (en) * 1939-07-14 1941-03-18 Raytheon Mfg Co Arc tube system
GB637644A (en) * 1944-11-29 1950-05-24 British Thomson Houston Co Ltd Improvements in and relating to power factor correction arrangements for intermittently energized inductive electric loads
CA620926A (en) * 1950-04-07 1961-05-30 Westinghouse Electric Corporation Electronic sequence timer
US2985816A (en) * 1955-02-17 1961-05-23 Westinghouse Electric Corp Voltage regulator for intermittent current operation
US3005947A (en) * 1957-07-31 1961-10-24 Westinghouse Electric Corp Electric discharge apparatus
US3202871A (en) * 1960-07-22 1965-08-24 Balakrishna R Shelar Solid state proportional power modulator
NL284981A (en) * 1961-11-02
US3452283A (en) * 1965-02-23 1969-06-24 Weltronic Co Timer
US3486042A (en) * 1965-05-18 1969-12-23 Gen Electric Zero crossing synchronous switching circuits for power semiconductors supplying non-unity power factor loads

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001007229A2 (en) * 1999-07-21 2001-02-01 Caco Pacific Corporation Closed loop interactive controller
WO2001007229A3 (en) * 1999-07-21 2001-05-25 Caco Pacific Corp Closed loop interactive controller
US6529796B1 (en) 1999-07-21 2003-03-04 Caco Pacific Corporation Closed loop interactive controller

Also Published As

Publication number Publication date
CA973257A (en) 1975-08-19
US3832518A (en) 1974-08-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee